A nurse is reviewing the ECG tracing strip of a client who is receiving telemetry monitoring.
The nurse should locate the S-T segment at which of the following locations on the electrocardiographic waveform.
The flat line between the QRS complex and the T wave.
The peak of the R wave.
The beginning of the P wave.
The interval between the S wave and the T wave.
The Correct Answer is A
Choice A rationale
The ST segment represents the time from the end of ventricular depolarization to the beginning of ventricular repolarization. It is identified as the flat baseline following the QRS complex and preceding the T wave. This segment is isoelectric, meaning it's at the same level as the PR segment, and any deviation can indicate myocardial ischemia or injury.
Choice B rationale
The peak of the R wave represents the peak of ventricular depolarization. It signifies the moment of maximum electrical activity in the ventricles, as the impulse spreads through the ventricular walls. It is a critical point in the QRS complex, but it is not the location of the ST segment.
Choice C rationale
The beginning of the P wave marks the onset of atrial depolarization. This electrical event represents the contraction of the atria as they pump blood into the ventricles. The P wave is the first deflection in the cardiac cycle and occurs well before the QRS complex and the ST segment.
Choice D rationale
The interval between the S wave and the T wave is not a standard electrocardiographic term. The correct terminology is the ST segment, which is a segment, not an interval, and it specifically follows the S wave and precedes the T wave. An interval would typically include a wave, like the QT interval. *.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Dark spots or floaters in vision are not a typical post-operative finding for cataract removal. They are more commonly associated with retinal detachment, which is a rare but serious complication. The client should be instructed to report this to the provider immediately.
Choice B rationale
Bruising of the eyelids is not a normal or expected outcome after cataract surgery. The procedure is typically performed with a small incision and does not cause significant trauma to the surrounding tissues, making bruising an uncommon occurrence.
Choice C rationale
Cataract surgery is almost always performed using a local anesthetic, not general anesthesia. A local anesthetic is administered to numb the eye and surrounding area, allowing the client to remain awake and aware during the procedure while feeling no pain.
Choice D rationale
The fundamental principle of cataract surgery is the removal of the clouded, opaque lens and its replacement with a clear, artificial intraocular lens (IOL). This is the definitive treatment for cataracts, restoring visual clarity and function to the eye. *.
Correct Answer is B
Explanation
Choice A rationale
Tomato soup is highly acidic due to its tomato base, which can relax the lower esophageal sphincter (LES) and increase stomach acid production. This can lead to the reflux of gastric contents into the esophagus, exacerbating the symptoms of GERD. The client should avoid highly acidic foods to manage their condition effectively.
Choice B rationale
White fish is a lean protein that is generally low in fat. High-fat foods can delay stomach emptying and decrease the pressure of the lower esophageal sphincter, increasing the risk of acid reflux. Lean proteins like white fish are less likely to trigger symptoms and are therefore a suitable dietary choice for a client with GERD.
Choice C rationale
Hot cocoa contains both caffeine and fat, which are known to exacerbate GERD symptoms. Caffeine can relax the lower esophageal sphincter, allowing stomach acid to reflux. Additionally, the fat content can delay gastric emptying, increasing pressure on the LES and worsening acid reflux symptoms.
Choice D rationale
Decaffeinated coffee can still trigger GERD symptoms. Coffee, even without caffeine, is acidic and can stimulate the production of stomach acid. The oils and compounds in coffee can also relax the lower esophageal sphincter, increasing the likelihood of acid reflux and causing irritation to the esophageal lining.
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